I've witnessed our decline firsthand; the growing rebellion among the young adults in the Church, the rise of "Christian contemporary" rock music, the transformation of churches from houses of worship to centers of entertainment (complete with gymnasiums, playgrounds and "campuses,") the "business/marketing" mentality becoming the all-engrossing concern of the highest levels of leadership. It's absolutely tragic, and it has been deadly.
You are dead-on correct. Even our “conservative” churches are mainly happy talk in their sermons and song lyrics.
Our evangelical churches are all about getting closer to Jesus (I love you, you love me, I love you, you love me) and utter only banalities about evil, if there is any mention at all.
Our supposedly rightwing fanatic churches never have any deep discussion of the evils of homosexuality. No wonder young people grow up thinking the homosexual lifestyle is OK. They never hear about it in church.